# Ellipse equation review

Review your knowledge of ellipse equations and their features: center, radii, and foci.

## What is the standard equation of an ellipse?

$\dfrac{(x-h)^2}{a^2}+\dfrac{(y-k)^2}{b^2}=1$
This is the standard equation of the ellipse centered at $(h,k)$, whose horizontal radius is $a$ and vertical radius is $b$.
Want to learn more about ellipse equation? Check out this video.

## Tjek din forståelse

Want to try more problems like this? Check out this exercise.